Wireless Network Problem

Hi,
I have problem that i didn't had before. I don't know is it from the router or my laptop. When i am in my room (2 meters from the router) i have perfect connection. But when i will go out to the other rooms of the house, downstairs or on the terase my internet connection stops. I can see the Wireless Network, but when i click connect comes " Unable to connect ". I didn't had this problem before, i have use my Wireless maybe in range of 50 meters. I don't know what is the problem, i even reinstall the Win7 and its still the same. Help ?

And crazy thing is that i use Android phone with Wi-Fi. And the phone works perfect with the internet, and i don't have this problem on the phone. It's only on the laptop.

well i tried that but didn't work. But is it possible for the Wireless of the laptop is weaker than before ? or the router is f..ked up ?

Look at this image and u will know what i am talking about...

Look at what i have make with red, on my laptop the signal is 5/5 lines, but on the router is 3/5 lines. So i am confused, is my laptop lying about the signal, or the router don't get the full signal. Because as i sad before, when i am far, i can see the network but it comes " Unable to connect ".